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Rapid laser fabrication of long-term stable superhydrophilic aluminum surface
摘要： A simple method for fabricating stable superhydrophilic aluminum surface is reported in this paper. Controllable micro-nanostructures were prepared on the surface of aluminum plate by nanosecond laser and then soaked in boiled 45% ethanol solution for 2 h as the post-treatment. It is demonstrated that the laser-ablated aluminum plate surface is hydrophilic and then switch to superhydrophilic after a 45% ethanol solution post-treatment. The treated superhydrophilic structure has good hydrophilic stability in a certain period of time. The mechanism of superhydrophilic behavior of aluminum surface treated with laser and ethanol solution was discussed. A new method for preparing stable superhydrophilic surface is proposed in this paper, which is of great significance for the preparation of superhydrophilic surface and the application of superhydrophilic surface in industrial production.
关键词： Superhydrophilic surface,Ethanol solution,Nanosecond laser,Aluminum,Contact angle
更新于2025-09-23 15:21:01
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Ethanol–water-assisted room temperature synthesis of CsPbBr3/SiO2 nanocomposites with high stability in ethanol
摘要： All-inorganic halide perovskites have attracted great attention by virtue of the merits of bright emission, tunable wavelength and narrow-band emission. Despite the excellent optical features, all-inorganic halide perovskite materials have suffered from intrinsic instability, which has limited their applications in various optoelectronic devices. To mitigate the intractable issue, we demonstrated the CsPbBr3 nanoparticles decorated with smaller SiO2 nanocrystals to passivate the surface defects; SiO2 nanoparticles were applied as a barrier layer to maintain the optical property and enhance environmental stability. A facile in situ method was proposed to prepare CsPbBr3/SiO2 nanocomposites, in which an environmental ethanol/water solvent system was needed with the addition of tetraethyl orthosilicate (TEOS) as a silicon precursor. The obtained CsPbBr3/SiO2 nanocomposites have better optical characteristic and stability than bare CsPbBr3 nanoparticles. Even 70% photoluminescence intensity of as-prepared CsPbBr3/SiO2 nanocomposites can be maintained after 168 h storage in ethanol. This newly developed synthesis will open up a new route for the fabrication of optoelectronic devices in an environmentally friendly way, and the as-obtained perovskite materials with improved stability will make them great potential for multifunctional optoelectronic devices.
关键词： Ethanol–water-assisted room temperature synthesis,All-inorganic halide perovskites,High stability,CsPbBr3/SiO2 nanocomposites,Optoelectronic devices
更新于2025-09-23 15:21:01
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A Film-based Fluorescent Sensor for Monitoring Ethanol-Water Mixture Composition via Vapor Sampling
摘要： In situ, on line, non-contact and fast monitoring of compositions of ethanol-water mixtures via vapor phase sampling remains challenge for years. In this work, we report for the first time of a film-based fluorescent sensor showing unprecedented discriminative ability to the compositions of ethanol-water mixtures. Importantly, ethanol content in the mixtures could vary from 0 to 100% (v/v), the response time is less than 2 s, and the sensing is fully reversible. More importantly, the monitoring was performed via vapor phase sampling, avoiding sample contamination. The principle behind is ascribed to the big difference of the fluorescent quantum yield of the sensing unit, a newly designed and synthesized mono-substituted fluorescent o-carborane derivative (ZPCarb), in the two solvents. In addition, the sensor as developed was successfully used for the determination of ethanol contents in four commercial liquors, suggesting its potential applications in quality control of beverages, monitoring fermentation processes, etc. in a quantitative way.
关键词： Vapor sensing,Ethanol-water mixture,Film-based fluorescent sensor,Fluorescent o-carborane derivative
更新于2025-09-23 15:21:01
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Novel ethanol vapor annealing treatment of SnO2 quantum dots film for highly efficient planar heterojunction perovskite solar cells
摘要： As a promising electron transport layer (ETL) material, tin oxide (SnO2) has been widely used for high-quality perovskite solar cells (PSCs). To further raise power conversion efficiency (PCE) of the PSCs, it is critical to improve the performance of SnO2 film. Herein, a facile method is proposed to tailor the properties of SnO2 ETL by treating it with ethanol vapor during the annealing process. With such treatment, the conductivity and electron mobility of SnO2 film are improved. More impressively, the absorption peak in intensity of the perovskite film deposited on the ethanol vapor-treated SnO2 (E: SO) shows an increase, and the defect states are also effectively passivated. Thus, the VOC and FF of the devices based on the E: SO are greatly improved. Finally, the device achieves a champion PCE of 17.66%, which is superior to the control device of 16.62%. The results demonstrate that ethanol vapor annealing treatment is an effective method for improving the performance of photovoltaic devices based on SnO2 ETL.
关键词： annealing process,ethanol vapor treatment,tin oxide quantum dot,Perovskite solar cell
更新于2025-09-23 15:19:57
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[IEEE 2018 IEEE SENSORS - New Delhi, India (2018.10.28-2018.10.31)] 2018 IEEE SENSORS - Defect Control in MoO<inf>3</inf> Nanostructures as Ethanol Sensor
摘要： Transformation of MoO3 nanobelts into MoO3 nanofibers with high surface defect has been achieved by the application of pulsed temperature during hydrothermal growth. MoO3 nanobelts and nanofibers are characterized by field emission scanning electron microscopy (FESEM), x-ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HR-TEM), and surface area analysis by nitrogen adsorption-desorption technique. Results clearly revealed that high crystalline, lower thickness, high surface area, and high surface defects are present in the MoO3 nanofibers as compare to MoO3 nanobelts. Furthermore, ethanol sensing properties of these MoO3 nanobelts and MoO3 nanofibers were examined, where MoO3 nanofibers show superior ethanol sensing properties due to the above mention advantages in MoO3 nanofibers.
关键词： defect,ethanol,gas sensor,MoO3 nanofibers
更新于2025-09-19 17:15:36
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An Efficient Room Temperature Ethanol Sensor Device Based on p-n Homojunction of TiO <sub/>2</sub> Nanostructures
摘要： In this paper, an efficient room temperature ethanol sensor device based on p-n homojunction of p-TiO2 nanoparticles (NPs) and n-TiO2 nanotubes (NTs) is reported. p-TiO2 NPs were prepared by low-temperature sol–gel method and coated on n-TiO2 NTs (NPs) grown by electrochemical anodization. Field emission scanning electron microscopy and X-ray diffraction authenticated the formation of stable homojunction between p-type anatase TiO2 NPs and n-type anatase TiO2 NTs. Current–voltage characteristics of the device, in the lower voltage range (0–1.26 V) for 30 °C, followed nonlinear characteristics (Schottky). With increase in voltages (>1.26 V) and temperature (40 °C–100 °C) such nonlinear behavior moves toward more linear ones. The gas sensing performance of the homojunction device was studied at room temperature with alcohols as the test species. The device offered the maximum response magnitude of ～57% (toward ethanol) at 100 ppm with appreciably fast response time and recovery time of ～30 and ～16 s, respectively. Dramatic increase in the effective depletion region area distributed throughout the nanotubular voids and the associated localized electric filed originated from the electrostatic charge separation therein (which helps in easy dissociation of target species) is possibly responsible for such efficient room temperature sensing performance.
关键词： room temperature,Ethanol sensing,fabrication and characterization,p-TiO2 nanoparticles (NPs)/n-TiO2 nanotubes (NTs),homojunction
更新于2025-09-19 17:15:36
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Complex-surfactant-assisted hydrothermal synthesis of one-dimensional ZnO nanorods for high-performance ethanol gas sensor
摘要： One-dimensional (1D) ZnO nanorods (ZNRs) were synthesized by a facile and effective hydrothermal method using the mixture of sodium dodecyl sulfate (SDS) and polyethylene glycol 400 (PEG400) with a molar ratio of 1:1 as the complex surfactant. The microstructure and morphology were characterized using of X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. The results demonstrated that the ZNRs are of a single crystal hexagonal wurtzite structure, having a larger length-to-diameter ratio with more regular surface morphology compared with the ZnO products obtained in the presence of only SDS or PEG400. A possible growth mechanism was proposed based the mediation reaction of the complex surfactant. Gas sensing measurements indicated that the ZNRs assisted by the complex surfactant demonstrated excellent ethanol sensing properties at an optimal operating temperature of 300 °C, which could be ascribed to their large length-to-diameter ratio, one-dimensional structure, and numerous surface defects of oxygen vacancies.
关键词： Zinc oxide,Gas sensor,Ethanol,Nanorods,Complex surfactant
更新于2025-09-19 17:15:36
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Direct functionalization of methane into ethanol over copper modified polymeric carbon nitride via photocatalysis
摘要： Direct valorization of methane to its alcohol derivative remains a great challenge. Photocatalysis arises as a promising green strategy which could exploit hydroxyl radical (·OH) to accomplish methane activation. However, both the excessive ·OH from direct H2O oxidation and the neglect of methane activation on the material would cause deep mineralization. Here we introduce Cu species into polymeric carbon nitride (PCN), accomplishing photocatalytic anaerobic methane conversion for the first time with an ethanol productivity of 106 μmol gcat?1 h?1. Cu modified PCN could manage generation and in situ decomposition of H2O2 to produce ·OH, of which Cu species are also active sites for methane adsorption and activation. These features avoid excess ·OH for overoxidation and facilitate methane conversion. Moreover, a hypothetic mechanism through a methane-methanol-ethanol pathway is proposed, emphasizing the synergy of Cu species and the adjacent C atom in PCN for obtaining C2 product.
关键词： methane conversion,photocatalysis,polymeric carbon nitride,ethanol production,copper modification
更新于2025-09-19 17:15:36
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Hydrous ethanol detection using a graphene oxide-coated Fresnel reflection sensor
摘要： Ethanol accounts for approximately half of all biomass fuel production, being one of the most important renewable fuel sources. To meet the requirements for ethanol concentration monitoring, we propose a graphene oxide (GO)-coated fiber optic (FO) sensor. The ethanol concentration is derived from the Fresnel reflection intensities from the interface between sensor head and surrounding hydrous ethanol. The molecular enrichment properties of GO improved the sensitivity and concentration measurement range of the sensor. We observed fast linear responses with an average sensitivity of 0.08 dB/% in all the 0–100% concentration range, satisfying the requirements for hydrous ethanol monitoring.
关键词： Ethanol Concentration,Fresnel reflection,Graphene Oxide,Fiber-optic sensor
更新于2025-09-19 17:15:36
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Few-cycle laser driven reaction nanoscopy on aerosolized silica nanoparticles
摘要： Nanoparticles offer unique properties as photocatalysts with large surface areas. Under irradiation with light, the associated near-fields can induce, enhance, and control molecular adsorbate reactions on the nanoscale. So far, however, there is no simple method available to spatially resolve the near-field induced reaction yield on the surface of nanoparticles. Here we close this gap by introducing reaction nanoscopy based on three-dimensional momentum-resolved photoionization. The technique is demonstrated for the spatially selective proton generation in few-cycle laser-induced dissociative ionization of ethanol and water on SiO2 nanoparticles, resolving a pronounced variation across the particle surface. The results are modeled and reproduced qualitatively by electrostatic and quasi-classical mean-field Mie Monte-Carlo (M3C) calculations. Reaction nanoscopy is suited for a wide range of isolated nanosystems and can provide spatially resolved ultrafast reaction dynamics on nanoparticles, clusters, and droplets.
关键词： ethanol,water,SiO2 nanoparticles,photocatalysts,nanoparticles,Mie Monte-Carlo calculations,momentum-resolved photoionization,reaction nanoscopy,near-fields
更新于2025-09-19 17:13:59